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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | $ 6,958,685 |  | $ 6,871,122 |  |  |
Financing Receivable, Allowance for Credit Loss |  | (81,448) | $ (78,861) | (83,197) | $ (83,577) | $ (86,886) | $ (85,675)
Loans and Leases Receivable, Net Amount |  | 6,877,237 |  | 6,787,925 |  |  |
Construction Real Estate Commercial [Domain] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 208,284 |  | 214,561 |  |  |
Residential Real Estate Commercial [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 545,160 |  | 533,802 |  |  |
Residential Real Estate - Mortgage [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 1,018,924 |  | 1,033,658 |  |  |
Residential Real Estate - HELOC [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 162,533 |  | 165,605 |  |  |
Residential Real Estate - Installment [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 4,741 |  | 5,642 |  |  |
Commercial Financial And Agricultural [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 1,316,358 |  | 1,298,626 |  |  |
Financing Receivable, Allowance for Credit Loss |  | (12,747) | (13,288) | (14,025) | (15,222) | (16,279) | (25,608)
PPP loans receivable [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 13,428 |  | 74,420 |  |  |
Bank Overdrafts |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 3,763 |  | 1,127 |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance | [1] | 1,760,867 |  | 1,801,792 |  |  |
Financing Receivable, Allowance for Credit Loss |  | (22,339) | (23,731) | (25,466) | (22,749) | (24,487) | (23,480)
GFSC loans |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 748 |  | 1,793 |  |  |
Check loans |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 2,112 |  | 2,093 |  |  |
Finance Leases Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 19,617 |  | 20,532 |  |  |
Financing Receivable, Allowance for Credit Loss |  | (203) | $ (231) | (238) | $ (562) | $ (541) | $ (518)
Consumer less GFSC and Check Loans |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 1,806,226 |  | 1,685,793 |  |  |
Commercial Financial Agricultural less PPP and Overdrafts |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | $ 1,299,167 |  | $ 1,223,079 |  |  |
[1] | Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.

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